main.py

from flask import Flask , render_template,request
from flask_sqlalchemy import SQLAlchemy
from datetime import datetime





app = Flask(__name__)

app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///db.db'
app.config['SQLALCHEMY_TRACK_MODIFICATION'] = False 
db=SQLAlchemy(app)
app.app_context().push()

class Message(db.Model):
    id =db.Column(db.Integer,primary_key=True) 
    user =db.Column(db.String(200),nullable=True)
    content =db.Column(db.String(500),nullable=True)
    created_at =db.Column(db.DateTime(),default =datetime.utcnow)


@app.route("/<name>", methods=['GET','POST'])
def start_page(name):
    if request.method == 'POST':
        new_messege = Message(
            user = name,
            content = request.form['content']
        )
        db.session.add(new_messege)
        db.session.commit()
    messeges =Message.query.order_by(Message.created_at).all()
    return render_template('index.html',messeges=messeges,name=name)
db.create_all()


if __name__ == "__main__":
    app.run(debug=True)